This part is a kind of semiconductor called T2117.

Function of this product has Zero-Voltage Switch with Adjustable Ramp.

Manufacturers : ATMEL Corporation

Image and pinout :

Some of the text within the PDF file :

T2117 Zero-Voltage Switch with Adjustable Ramp Description The integrated circuit, T2117, is designed as a zerovoltage switch in bipolar technology. It is used to control resistive loads at mains by a triac in zero-crossing mode. A ramp generator allows power control function by period group control, whereas full-wave logic guarantees that full mains cycles are used for load switching. Features D Direct supply from the mains D Current consumption ≤ 0.5 mA D Very few external components D Full-wave drive – no DC current component in the load circuit D Negative output current pulse typ. 100 mA – short-circuit protected D Simple power control D Ramp generator D Reference voltage Applications D Full-wave power control D Temperature regulation D Power blinking switc [ ... ]

T2117 PDF Datasheet Download